Flight Details
The pilot of a Piper PA-18 was cleared for a straight-in approach. From approximately 2000 feet above ground level (AGL) and about five miles from the runway, the pilot initiated a reduced-power descent.
Events During Approach
Approximately halfway through the descent, the pilot retarded the throttle to idle but did not apply carburetor heat. When the aircraft reached 400 feet AGL, the pilot realized the approach was too low and advanced the throttle to add power and arrest the descent. However, the engine did not respond to the throttle input. The pilot then applied full carburetor heat, but was unable to restart the engine.
Investigation Findings
Investigation determined that the pilot's descent had been conducted under conditions where severe carburetor icing could be expected at glide power. Although the PA-18 Owner's Handbook did not mandate carburetor heat use during all approaches, it required its application when icing conditions prevail.